Stamp-stem.



No. 70!,077. PatentedMay 27, I902.

w.. s. McKlN NEY.

STAMP STEM.

(Application filed Sept. 23, 1901.) (No Model.)

A TTORN E Y5 UNITED @TATE PATENT @FFICE.

VALTER SABIN MCKINNEY, OF CHICAGO, ILLINOIS.

STAlVl P-STEM.

SPECIFIGATIQN forming part of Letters Patent No. 701,077, dated May 27, 1902.

Application filedSepteinlier 23. 1901. Serial No. 76.231. No model.

To all w'lwnt 1115 may concern:

Be in known that I, WALTER SABIN MCKIN- NEY,of the city of Chicago,cunty of Oook,and State of Illinois, have invented certain new and useful Improvements in Stamp-Stems, of

which the following is a specification.

This invention relates to improvements in stems for stamps of that type used for reducing or crushing rock, ores, and the like, and refers more specifically to stems adapted for actuation to lift the stamp attached thereto by means of a cam or wiper.

Among the objects of the present invention are to provide a construction in stems of this character which will dispense with the camblock as a separate attachment, to provide a sectional construction in which the stem is composed of two or more interchangeable members which maybe variously arranged I both for the purpose of prolonging the life of the stem as a whole andalso to enable either part to be replaced in case 0f-= necessity for repair or renewal, and in general to provide a simple and improved construction of the character referred to.

The invention consists in the matters hereinafterdescribed,aud more particularlypoinc ed out in the appended claims, and the same will be readily understood from the following description, reference being had to the accompanying drawings, in which Figure 1 is a View principally in elevation,

but with the socketed end portion of one of the members shown in axial section. Fig. 2 is a View similar to Fig. 1, takenat right angles thereto, the lower end of thelower members being broken away to reduce thesize of the figure; and Fig. 3 is a lowerend or plan view of one of the stamp-stem'members.

It has been usual heretofore to make stampstems of this general character in a single piece and to mount thereon a cam block, which was held in position intermediate the length of the stamp-stem by means of suitable keys or keying devices. These stamp-stems are of massive and heavy construction, designed to lift dies or heads weighing from one thousand pounds upward, and the stamp as a whole is usually lifted by means of a cam or wiper and allowed to fall by its own weight. The repeated impact results in rapidly crystallizing the metal of the stamp-stem, and especially the lower end portion thereof, which is in immediateengagement with the stamphead or die, so that notwithstanding these stamp-stems be made of the best and toughest forging obtainable they are cpmparatively short lived. It has heretofore been common to so'construct these stamp-stems that they were reversible, or, in other words, so that either end might be attached to the stamp-head or die. This has been the most approved and durable construction heretofore known, and with this construction it has always, so far as I know, been the practice to employ an attachable cam-block mounted upon the stem intermediate its length and capable of being detached and reversed to correspond with the reversal of the stem. In practice it is impossible to secure cam-blocks of this description upon the stem with suflicient security. and immovability to prevent their being disarranged or the retaining devices broken in the course of extended use. This objection is so serious that in mills employinga series of a dozen or more stamps in regular operation a large part of the time of an operator is required to readjust and keep in orderthese stamp-stems. By means of my presentinvention Iovercome these objections to a large extent, if not entirely.

Referring tothe drawings, 1 designates as a whole a stamp-stem, which is provided at one end with an enlarged socket portion 2, forming one end of the section and provided with a lower end surface 3, adapted to form a shoulder or cam-surface for the engagement therewith of a cam or wiper at. In the preferred construction the socket portion 2 is made upwardly tapering or enlarged from the body of the stem downwardly to its lower end, so as to provide the relatively wide anin practice that by making the socket and interfitting shank properly tapered the parts the use of the stem. In use I employ two such stem-sections, as A B, the lower of which is engaged with the stamp-head or hammer, While theupper is similarly engaged with the upper end of the lower stamp-section. The cam-shaft 9, upon which the wiper 4 is mounted, is arranged transversely to the stem and at one side of the. upper end portion of the lower member, so as to support the wiper immediately underneath the overhanging camsurface 3, formed upon the lower end of the upper section, as shown clearly in the drawings. When thus arranged, it will be obvious that the, rotation of the wiper will serve to alternately elevate and drop the stamp as the shaft rotates.

In order to enable the stem-sections to be forced apart or separated when it is desired to rearrange orreplace one or the other, each section is provided with a transverse opening I or aperture 6, arranged in position to intercept the upper end of the socket 8, within which aperture a tapering drift may be driven, so as to engage the upper end of the interfitting stampshank wedge fashion and start the latter out of the socket.

While I have hereinreferred to the invention as embodied in a stamp-stem, it is to be understood that the term stamp should be construed as equivalent to the word hammer in its broader sense, itbeing obvious that the essential features of the invention are applicable to any drop-hammer in which the repeated impact tends to crystallize and rapidly weaken the part of the stem directly engaged with the hammer-head, and particularly in such cases where a cam or wiper is arranged to act upon a cam-block or cam .projectionlocated upon the stem at a point intermediate its length. I do not, therefore,

wish to be limited to the precise details of construction shown except to the extent that the latter are made the subject ofspecific claims.

I claim as my invention 1. A stem for stamps and analogous drophammers consisting of two or more sections adaped to be united in extension of each other, each section being adapted for connection with a hammer or stamp-head and being adapted at its opposite end for engagement with a similar stem-section, whereby saidstem -sections may be interchangeably arranged, as and for the purpose set forth.

2. A stem for stamps and analogous drophammers comprising two sections united in extension of each other, the upper member being constructed to telescope on the lower member and a cam-surface formed upon the lower end of the telescoping member, as and for the purpose set forth.

3. In combination, a stamp-stem comprising two sections adapted to be united in extension of each other, each comprising an enlarged and socketed lower end portion and a tapered upper end portion adapted for engagement with a socket similar to that at its lower end, a cam-surface upon the lower end of each stem-section and a cam or wiper located adjacent to one side of the stamp-stem and immediately below the lower end of the upper stem-section in position to engage the cam-surface'thereof.

4:. As a new article of manufacture,a stampstem section comprising a main body portion provided at one end with an enlargement provided with an inwardly-tapering axially-disposed socket, a transverse drift-aperture intersecting the upper end of said socket, a camsurface formed at the lower end of said en largement and a tapered opposite end portion adaptedfor engagement with a socket substantially similar to that provided in the opposite end of said section.

WALTER SABIN MCKINNEY. Witnesses:

FREDERICK G. GooDwIN, ALBERT H. GRAVES. 

